...yellowed... lived, loved, ...yellowed... chatted, chewed ...yellowed. and over all those years your teeth...have e llowed. fact is, if you're not whitening, you're yellowing. crest 3d white whitestrips remove over ten years of stains by going below the enamel surface. and, they whiten 25 times better than a leading whitening toothpaste. crest whitestrips. life opens up when you do. that fridge in your kitchen may have crossed this bridge. your new car probably rode these rails. that shipment you just received was tracked by satellite. we build and maintain. we invest and innovate. soe can deliver what america needs. this year alone, freight rail companies plan to spend twenty-three billion of their own money, not taxpayer dollars, to build bridges, maintain track, and develop new technologieso keep freight rail and our economy moving. there's a lot riding on these rails.